Telephone-transmitter



(No Model.) W H. COLLINS.

TELEPHONE TRANSMITTER. ,119- Patented-Nov. 9, 1886.

WITNESSES: INVENTOR A T TORIVE Y5 N. PETERS Pmwmpu w, Wnhingtam n.c.

v UNITE STATES;

WILLIAM H. OQLLINS,-OF CHICAGO, ILLINOIS.v

PATENT OFFICE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 352,119, dated November 9, 1886.

Application filed MaylO, 1886. Serial No.201,69Q. (No model.)

mitter for telephones described and claimed in Letters Patent of the United States issued to George M. Hopkins on the 30th day of May, 1882, and the 31st day of March, 1885, and numbered, respectively, 258,757 and 314,841. In the transmitter described in the Letters Patent above referred to an electrode'is held by ayielding support in contact with a similar electrode secured to the inner face of the vibratory diaphragm. 1 t

The present invention consists in novel means for supporting the yielding electrode in contact with the electrode carried by the diaphragm, the object being to accomplish the most perfect adjustment possible of the electrodes and to provide for their full face-to-face contact.

In the accompanying drawings, which illustrate the invention, Figure 1 is a central vertical section of a portion of the resonant box inclosing the diaphragm, electrodes, and yielding support. Fig; 2 is a rear elevation of the transmitter, and Fig. 3 is an enlarged vertical section of the yielding electrode and its means of support. r

In the drawings, A denotes the resonant box, and Bthe lid or cover thereof, having a mouthorifice, G, in rear of which is secured, in a cell, D, the usual Vibratory diaphragm, E, carrying the electrode or carbon button F, the latter beingheld in place by a screw, G.

Upon the rear face of the cell D, at opposite points, are secured the blocks H I, of hard rubber or other non-conducting material, to the upper face of the former of which is affixed by a screw, J, one end of the delicate bar-spring M, the other end of which passes centrally across the cell D to the block I, where it partially incloses and is secured to the horizontal adjusting-pin N, journaled in lugs a b of said block, and provided with aslotted head, 0, by which it may be conveniently turned either to ward or from the block H, for thepurpose of lessening or increasingthe tensionof thesprin g. In the lug b is provided a set-screw, d, by which the pin N may be-ret-ained in any set position.

portion of which projects over the spring M and carries a transverse set-screw, f, the'point of which is in. contact with said spring, and which is supplied with a locking-nut, i. The purpose of the screw f is to aid the pin N in adjusting the tension of the spring M.

Upon the spring M, at about the center of its inner face, is rigidly secured the transverse pin P, which is conical in form, as shown more distinctly in Fig. 3, and is seated in a correa spondingly-formed socket in the metallic bushing m, the latter being embedded in the trans-- verse center of the electrode or carbon button Q. The electrodeQ is supported upon the pin P, and thellatter is given a conical outline, in order that it may sustain the former parallel with the electrode F-that is, that the inner faces of the two electrodes may be parallel to each other at all times, the purpose being to insure the full face-to-face contact of the electrodes at the proper time during the action of the diaphragm E when subject to atmospheric vibrations due to articulate sounds directed into the speaking-orifice O. The best and most distinct results may be obtained when the con tact-faces of the electrodes are held parallel to each other, since if the electrode Q is allowed to have any material lateral play it may only 8 touch the electrode F at one side or edge, in-' stead of squarely face to face, and under such conditions the electric circuit may be more or less imperfect for telephonic communication.

The electrode Qis held in close relation with the electrode F by the spring M, the'exact position of the first-mentioned electrode being capable of adjustment at will by means of the pin N alone or aided by the screw f. The tightening of the spring by rotating the pin N increases its stiffness, and this may be accelerated and the button Q brought into closer relation with the electrode F by' operating the screw f against the spring, as indicated in Fig.1.

The object of the spring M, pin N, and screw f is to afford a means by which the electrode Q may be given the most accurate adjustment attainable without moving the said electrode to any material extent from a given position.

Upon the block His applied a plate, 0, one

. The pin N has a smooth external surface, and

hence when turned does not move longitudinally in its bearings, and as a consequence operates to draw the spring in a direct line across the electrodes.

Vhat I claim as myinvention, and desire to secure by Letters Patent, is-

1. In a telephone, the vibratory diaphragm and electrodes or buttons, combined with the transverse bar spring extending centrally across the diaphragm and held in blocks at the opposite sides thereof, means, substantially as described, for adjusting the tension of said spring, and a cone-shaped pin aflixed to the said spring and entering a correspondinglyformed seat in one of the electrodes, substantially as and for the purposes set forth.

2. In a telephone, the vibratory diaphragm and electrodes or buttons, combined with the transverse bar Spring extending centrally across the diaphragm and sustaining one of the electrodes, and being secured at one of its ends on a rotating tension-adjusting pin secured in bearings at right angles to the line of the spring, substantially as and for the purposes set forth.

3. In a telephone, the vibratory diaphragm and electrodes, combined with the transverse spring extending centrally across the diaphragm and sustaining one electrode, one of the ends of the spring being secured to a rotary adjusting-pin mounted at right angles to it, and the other end thereof being firmly held and provided with an independent tensionserew, substantially as and for the purposes set forth.

Signed at New York, in the county of New York and State of New York, this 7th day of May, A. D. 1886.

\VILLI AM H. COLLINS.

Vitnesses:

CHAS. O. GILL, WILLIAM B. ELLISON. 

